Pre-oxidation has been reported to be an effective way to remove algal cells in water,but the released algal organic matter(AAOM)could be oxidized and lead to the increment in disinfection by-product(DBP)formation.The relationship between pre-oxidation and AOM-derived DBP formation needs to be approached more precisely.This study compared the impact of four pre-oxidants,ozone(O3),chlorine dioxide(ClO2),potassium permanganate(KMnO4)and sodium hypochlorite(NaClO),on the formation of nitrogenous(N-)and car-bonaceous(C-)DBPs in AOM chlorination.The characterization(fluorescent properties,molecular weight distribution and amino acids concentration)on AOM samples showed that the characterization properties variations after pre-oxidation were highly dependent on the oxidizing ability of oxidants.The disinfection experiments showed that O3 increased DBP formation most significantly,which was consistent with the result of characterization properties variations.Then canonical correspondent analysis(CCA)and Pearson's correla-tion analysis were conducted based on the characterization data and DBP formation.CCA indicated that C-DBPs formation was highly dependent on fluorescent data.The formation of haloacetic acids(HAAs)had a positive correlation with aromatic protein-like component while trichloromethane(TCM)had a positive correlation with fulvic acid-like component.Pearson's correlation analysis showed that low molecular weight fractions were favorable to form N-DBPs.Therefore,characterization data could provide the advantages in the con-trol of DBP formation,which further revealed that KMnO4 and ClO2 were better options for removing algal cells as well as limiting DBP formation.

Key Laboratory of Building Safety and Energy Efficiency,Ministry of Education,Department of Water Engineering and Science,College of Civil Engineering,Hunan University,Changsha 410082,China

[1]Da Sheng;Lingjun Bu;Shumin Zhu;Yangtao Wu;Jue Waang;Nan Li;Shiqing Zhou-.Impact of pre-oxidation on the formation of byproducts in algae-laden water disinfection:Insights from fluorescent and molecular weight)[J].环境科学学报（英文版）,2022(07):21-27

AAOM,bonaceous,haloacetic,trichloromethane

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